New Caledonia is about 4.5 times smaller than Austria.

Austria is approximately 83,871 sq km, while New Caledonia is approximately 18,575 sq km, making New Caledonia 22.15% the size of Austria. Meanwhile, the population of Austria is ~8.9 million people (8.6 million fewer people live in New Caledonia).
This to-scale comparison of Austria vs. New Caledonia uses the Mercator projection, which distorts the size of regions near the poles. Learn more.

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